Why my Windows desktop gadgets not working or not displaying properly?

1. A subkey with foreign/ASCII character exists under the “Zones” registry key.How to fix it ?

2. XML registration is missing in the system. How to fix?

3. Something went wrong with Windows Sidebar Setting.ini file and gadgets file.
   How to delete:

–Click Start or press Windows key –> Type taskmgr.exe –> Press ENTER –> Click tab Processes –> Right click sidebar.exe –> Click End Process.
–Click Start or press Windows key –> Type %LOCALAPPDATA%\Microsoft\Windows Sidebar-->Press ENTER –> Delete all Gadgets file and Setting.ini.

How to bring Windows desktop gadgets to the front by using a keyboard shortcut?
Press the Windows Logo key + G.

IF sometime some win gadget monitoring not working, this is solution:
Click Start or press Windows key –> Type Regedit.exe and press Enter –> Navigate to the following branch:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Perfdisk\Performance
If you find a value named Disable Performance Counters listed there and the value is 1 (mean disable) just change it to 0 (mean enable) and then restart the computer.

FOR FAST CHECK
1, CLEAR CASHE (DELETE DIR)
%LOCALAPPDATA%\Microsoft\Windows Sidebar\Cache
2, Enable monitoring in
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Perfdisk\Performance >> Disable Performance Counters >> to >> 0

SOURCE
http://addgadgets.com
http://www.thewindowsclub.com